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Investments - Additional Information (Detail) | 12 Months Ended |
--- | --- | ---
Dec. 31, 2017 | Dec. 31, 2016
Bottom of range [member] |  |
Disclosure of detailed information about investment property [line items] |  |
Interest rates on time deposits | 1.37% | 1.00%
Bottom of range [member] | United States of America, Dollars |  |
Disclosure of detailed information about investment property [line items] |  |
Interest rate on long term time deposit | 3.20% |
Top of range [member] |  |
Disclosure of detailed information about investment property [line items] |  |
Interest rates on time deposits | 3.75% | 3.75%
Top of range [member] | United States of America, Dollars |  |
Disclosure of detailed information about investment property [line items] |  |
Interest rate on long term time deposit | 3.75% |

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- Definition Long-term deposits interest rate. + References No definition available. + Details
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- Definition Percentage of time deposits. + References No definition available. + Details
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- Definition Line items represent concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes of the table. + References No definition available. + Details
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- Details
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- Details
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